Posted 8/7/2012 20:05 (#2526977 - in reply to #2525773) Subject: RE: new holland knotter
I'd also start simple. Sharpen the twine knives, preferably with a file or whet stone, then check the stripper clearance to the billhook. It should give a fairly firm wipe from the tip back about 11/16" towards the heel.
Your manual might also give some pictures of failed knots and their causes...